Cooling duct arrangement for air-cooled motors



H. KLAUE July 13, 1954 COOLING DUCT ARRANGEMENT FOR AIR-COOLED MOTORSFiled March 26, 1951 Patented July 13, 1954 UNITED STATES ATEN T OFFICECGOLING DUCT ARRANGEMENT FOR AIR-COOLED MOTORS Application March 26,1951, Serial No. 217,606

Claims priority, application Germany March 27, 1950 2 Claims.

The invention relates to the problem to use aircooled motors in smallmotor cars without a blast-engine for the purpose to spare expenses. Thecooling of such motors employed up to now includes the danger that thecylinders are not sufiiciently cooled. It has been stated by tests thatif an approximately streamline shaped car body moves on a track waywhich is at a standstill a strong overpressure results at the front sideof the car and a strong vacuum at the first third of the lower side. Theinvention described hereafter uses this knowledge for the purpose to geta best possible cooling effect.

The invention starts from an arrangement of the motor having its crankshaft arranged across the driving direction of the motor car. Theinvention consists in that the motor cylinders, which are suspended,project into a cooling channel extending rearward from the front side ofthe car to the lower side of the car body; the upper delimitation ofwhich is formed by the crank casing, the gearing and the drive or aguide sheet respectively.

The drawing shows an embodiment of the invention by way of example. Thefigure illustrates a longitudinal section through the air-coolingchannel provided in the front portion of the motor car.

The reference numeral l designates a leading wheel and 2 the car bodyprovided with a cooling channel it. At the front side of the car body anair entrance 3 and on the lower side of the car body an exit opening 4is provided. The cylinders 5 of the motor are suspended within the saidcooling channel. The crank casing 6, the gearing l and the drive 8 arearranged across the driving direction of the motor car outside of thecooling channel proper. The cooling air is guided by a guide sheet 9separating the cooling channel I 0 from the other motor space. The lowerside of the cooling channel is limited by the guide sheet ll.

As a strong overpressure exists at the front side of the running car anda strong vacuum at the first third of the lower side the cooling air issucked in through the front opening 3 of the coolin channel It. The airstream cools the motor cylinders 5 so well that a cooling by aventilator is superfluous. The abolition of the ventilator drivedischarges the motor from this work.

Having thus particularly described the nature of my said invention andthe manner in which the same is to be performed, what I wish to havecovered by Letters Patent is:

1. In a cooling device for motor cars an air duct sloping in a downwarddirection from the front of the car to the front portion of itsunderside in combination an inclined crank case containing a crank shaftand gears journalled therein having their axes extending at a rightangle to the traveling direction of the car, said crank case extendingabove and in the sloping direction of said air duct and motor cylinderssuspended from said inclined crank case and projecting into said airduct.

2. In a cooling device for motor cars an air duct slipping in a downwarddirection from the front of the car to its underside in combination aninclined crank case containing a crank shaft and gear journalled thereinhaving their axes extending at a right angle to the travelingdirectionor" the car, said crank case extending above and in the slopingdirection of said air duct and motor cylinders suspended from saidinclined crank case and projecting into said air duct and an upper and alower guide sheet limiting the upper and the lower side of said airduct.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,648,505 Persu Nov. 8, 1927 1,772,196 Wallace Aug. 5, 19301,925,415 Strauss Sept. 5, 1933 FOREIGN PATENTS Number Country Date220,080 Switzerland June 16, 1942 506,892 Germany Sept. 10, 1930 708,179France Apr. 27, 1931 859,509 France June 10, 1940 874,365 France May 4,1942 900,715 France Oct. 16, 1944

